Mei Tachibana is a high school student. Due to a traumatic incident when she was a kid, Mei has been unable to make friends or have boyfriends. By mistake, Mei then injures the most popular male student named Yamato Kurosawa. Somehow, Yamato Kurosawa likes Mei Tachibana and tells everyone unilaterally that Mei is his friend. One day, Yamato Kurosawa saves Mei Tachibana from a stalker by kissing her. From that kiss, their love story begins.
Unfortunately the movie Say 'I Love You' is not yet available on HBO Max.
| Writing | Asako Hyuga | Screenplay |
| Directing | Asako Hyuga | Director |
| Sound | Yu Takami | Original Music Composer |
| Production | Minori Tabuchi | Producer |
| Production | Daisuke Fukushima | Producer |
| Production | John Ledford | Executive Producer |
| Writing | Kanae Hazuki | Comic Book |
| Sound | Kazuhiro Kurihara | Sound Recordist |
| Camera | Yûta Tsukinaga | Director of Photography |
| Production | John Ledford | Producer |
| Costume & Make-Up | Kumiko Iijima | Costume Designer |
| Production | Fumitsugu Ikeda | Producer |
